Forced air is very common here, and is the rule for more modest old homes while the quality older homes have/had boilers and thus radiators. Newer homes may have one or another electric systems.

As a Midwesterner, airing out the house happens for the final time prior to heating season and then only again after heating season has ended. There is some exchange, because of older houses not being air-tight. (That would have been lethal back in the coal burning days.) Mind you, there is some weirdness regarding some people opening the windows regardless of time of year.

In case you didn't know, many American homes have bathroom fans (you do lose some heat unless there is an exchanger, but don't get too much cold air in) and or range hoods in the kitchen.